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| Evaluation on Sealing Reliability of Two Kinds of Fluorinated Rubber in High Temperature, High Pressure and High CO2 Environment |
| Received:September 27, 2020 Revised:October 10, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.11.003 |
| KeyWord:simulation condition stress state CO2 corrosion fluorosilicone rubber physical properties permeability resistance sealing reliability |
| Author | Institution |
| LI Tian-lei |
China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu , China;CNPC Key Tubular Goods Laboratory, Chengdu , China |
| CAO Da-yong |
Southern Sichuan Aerospace Energy Technology Ltd, Luzhou , China |
| LI Ke |
China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu , China;CNPC Key Tubular Goods Laboratory, Chengdu , China |
| ZHONG Yang |
State Key Laboratory of Southwest Petroleum University Oil and Gas Reservoir Geology and Exploitation, Chengdu , China |
| JIANG Fang |
China Petroleum Engineering & Construction Corporation Southwest Company Co.Ltd., Chengdu , China;CNPC Key Tubular Goods Laboratory, Chengdu , China |
| ZENG De-zhi |
State Key Laboratory of Southwest Petroleum University Oil and Gas Reservoir Geology and Exploitation, Chengdu , China |
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| Abstract: |
| The work aims to study the sealing reliability of two kinds of fluorosilicone O-ring in high temperature, high pressure and high CO2 environment (25 MPa, 5% CO2, 120 ℃ and 7000 mg/L Cl‒). The actual conditions were simulated by the high-temperature and high-pressure autoclave. The stress state of the specimen was realized with self-grinding rubber O-ring sealing device. The corrosion resistance and sealing properties of two kinds of fluorine rubber O-rings were tested and evaluated in terms of physical properties, corrosion morphology and permeability resistance. The tensile strength of fluorosilicone O-ring decreased from 18.1 MPa to 13.4 MPa and the elongation at break decreased from 172.8% to 151.9% after corrosion under stress state. After the corrosion of AFLAS rubber O-ring under stress state, the tensile strength decreased from 21 MPa to 14.6 MPa, the elongation at break decreased from 277 % to 212.3 % and the hardness decreased from 84 HA to 75.5 HA. The surface damage of AFLAS rubber O-ring was serious. The permeability resistance of two rubber O-rings decreased with the increase of differential pressure and temperature. The degree of performance attenuation of two rubber O-rings under stress state was lower than that under free state. The fluorosilicone O-rings show better sealing reliability under stress state. |
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